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Alguien me puede ayudar con esta demostración?

Alguien me puede ayudar con esta demostración.

En resumen

<img src="https://tex.z-dn.net/?f=%5Ctextbf%7BDemostraci%5C%27on%7D%28%5Ctextit%7Bpor%20inducci%5C%27on%7D%29.%5C%5C%20%5C%5C%0A%5Ctext%7BPara%20%7Dn%3D1%5Ctext%7B%20la%20proposici%5C%27on%20es%20verdadera%7D.

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